Fabric from artificial tereads



mm in, a. ma

UNITED ST TES PATENT emc ARTHUR L. EBLANGEB,

or raw Your, a. 1.,

m swarm WADEWITZ, 01' ELIZABETH- TON, TENIFSSEI, 81331038 '20 mum GEL-1128530" :couomnon, OI YORK, 11'. 2., A COBPOILTIOH O! DELAWARE IAEBIO no! In Drawing.

. it is the customary procedure to treatthe pro cipitated cellulosic material with a desulphurizing agent, such as sodium sul hide, ammonium sulphide and other desu phurizing agents, to remove the free sulphur held in the precipitated material, and totwist the filaments to form a thread before it is subjected to the handling necessary in the preparation of knitted fabrics.

It is an object of our invention to provide an improved and more economical process for preparing fabrics from precipitated cellulosic material and to provide a rocedure in which the above twisting step may be safely omitted. A further ob ect is to rovide an improved fabric containing arti cial cellu lose threads. Other objects will become aparent. i

In'followin our improved procedure, the preci itated laments are washed, preferably y passing treating liquids through the filaments, or groups of filaments which form a single untwisted thread, woundupon perforatcd receivers. The washed threads are then dried and used directly in the reduction of woven or knitted fabrics. A ter the threads have been made up into fabric, they are subjected to a desulphurizing operation in which they are treated with a sodium sulphide, ammonium sulphide or other suitable desulphurizing solution. The fabric may then be dyed, or otherwise treated to give the desired characteristics to the finished fabric.

When the cellulosic material is precipitated from a viscose spinning solution, the individual filaments have coatings of free sulphur which act as a binder and hold the group of filaments together. When the groups of .filaments or threads are desulphurized, as in the usual practice, this binder is removed and the resultant thread is made up of loose filaments, which fall apart so that the groups lose their thread characteristics.

The tensi e or breaking strength of the thread Application and mm as, 1931. and In.

etc.-an more -par-' sary new. is somewhat reduced by this desul hurizatio n,and in order to give the threa the required strength for use in the subsequent =textile operations, the (groups of loose filaments have to be subjects to a twisting on special machinery.

. B following-our improved. r0cedure, the bin er is retained upon the 'hlan'lents after they have gone through the knitting, weavin or other textile operations required to pro uce a commercially salable fabric :in which operations'thev are subjected-t0 wear and to severe tensi e and other breaking strains. Since the tensile strength of this sulphur coated thread is somewhat greater than that of the desulphurized thread and the filaments are bound together without a special twisting operation, it is not necestosubject "the thread to a twisting operation.

Other binders, in addition to the sulphur, suchas oil, parafiin or sizing solutions, may

warrants it.

until if the v After the knitting,weaving, or other textile operation, the sulphur and/or other binder may be removed and the fabric may be treated as desired to ya suitable solvent give it the desired color and characteristics.

The threads of the fabricproduced as described are made up of substantiall parallel filaments, rather than twisted fi aments, and are in a loose, fluffy-condition. The fabric produced in this manner is a lighter and moreflufiy material, having agreater covering power per pound of yarn used than in the case of artificial yarn produced by the usual procedure. By omitting the twisting ste the hairing which results from high twists is avoided and the resulting iabric is fuller and has a warmer feeling due' to the air spaces in the yarn.

Although a specific reference has been made to the treatment of artificial silk from the viscose process, in which sulphur isthe binder, it is not intended to restrict the invention to this particular embodiment, since it may be'usedin manymodified forms or ap- 2 roman:

plied to other types of yarn, for example,

a desul hurized am, or a yarn containin no sulp ur, may e coated with a binder an may be used without twisting, in making a 5 fabric, after which the binder may be removed to produce a fabric of improved characteristics.

The terms used in describing and claiming our invention have been used in their descriptive sense and not as terms of limitation and it is intended to include all equivalents of these terms within the scope of the ap ended claims.

at we claim is:

1. A method for producing a fabric of artificial cellulosic material, comprising precipitatin the filaments with a binder of sulphur on y, forming the precipitated filaments-into a fabric withouttwisting, and

thereafter removing the binder from the filaments. V

In'the production of a fabric from artificial cellulosic material, the steps comprising weaving or knitting an untwiste'd precipitated. cellulosic thread containing a binder of sulphur only to form the fabric and-thereafter dissolving the binder from the threads of the fabric.

3.. A method for producingfabric of artificial cellulosic material comprising precipitating the. filaments with a binder of sulphur, forming the precipitated filaments ound'together by sulphur only, into a fabric without twisting, and thereafter removing the sulphur binder from the filaments.

- 4. A method for producing fabric of artificial cellulosic material, comprising precipitating a Eviscose spinningsolution to form filaments of a thread, forming the untwisted o precipitated thread bound together by sulphur only into a fabric and thereafter desulphurizing the thread in the fabric.

' 5. In the preparation of a fabric from artificial thread, the steps comprising prepar-' ing parallel filaments of artificial cellulosic material bound together with a binder of sulphur alone to prevent breaking durin the working of the thread to produce a fa ric, forming the untwisted thread into a fabric,

and thereafter removing the binder.

6. A yarn of viscose filaments adapted to be woven, knitted, or otherwise made u into fabric, said filaments being untwiste and held together by sulphur alone without the necessity of pre-treatment with a binder.

In testimony whereof, we have signed our names to this specification.

Dated, March 27,1931.

ARTHUR L. ERLANGER.

go Dated, March 19th, 1931. 7

DR. MARTIN WADEWITZ. 

